CVE-2026-43366

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The legacy recycling is missing checking if the\nbuffer_list still exists, and if it's of the correct type. Add those\nchecks."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - The vulnerable code is reachable through local `io_uring_setup`, `io_uring_enter`, and `io_uring_register` operations using provided buffer selection and buffer-ring registration. It is not directly reachable from network packets or physical/adjacent interfaces.\nAC:L - The attacker controls the io_uring ring, the legacy provided buffer group, the in-flight async/io-wq request, and the conversion/removal of the same buffer group. The required timing can be driven by attacker-controlled concurrent local operations, so the race/lifecycle window is low complexity.\nPR:L - Exploitation requires a local unprivileged user able to create and use an io_uring instance; the relevant setup/register/submit paths do not require real root or init-namespace capabilities when io_uring is enabled. This is basic local user privilege, not administrator privilege.\nUI:N - No victim action is required after the attacker runs local code. The attacker performs all setup, submission, and buffer group conversion operations directly.\nS:U - The bug corrupts kernel memory from within the kernel/io_uring security authority and can lead to local kernel compromise or crash. It does not inherently cross a VM, IOMMU, or separate authorization boundary.\nC:H - The legacy recycle path can type-confuse a ring-provided buffer list and write kernel pointers into attacker-observable ring memory, and subsequent use can treat attacker-influenced objects as buffer-ring state. This is kernel memory corruption with a defensible path to high confidentiality impact.\nI:H - Recycling a legacy `struct io_buffer` into a ring buffer list corrupts list/ring state and can turn later ring-buffer operations into controlled kernel memory misuse. As a type confusion/memory corruption bug, high integrity impact is appropriate.\nA:H - If the target buffer list has been removed the old code can dereference a NULL buffer-list pointer, and if it has been upgraded it corrupts kernel state. 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This can happen if the request\nis forced via io-wq. The legacy recycling is missing checking if the\nbuffer_list still exists, and if it's of the correct type. Add those\nchecks."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nio_uring/kbuf: verificar si la lista de b\u00faferes objetivo sigue siendo heredada al reciclar\n\nExiste una brecha entre el momento en que se tom\u00f3 el b\u00fafer y cuando potencialmente se recicla, donde si la lista est\u00e1 vac\u00eda, alguien podr\u00eda haberla actualizado a un tipo proporcionado por el anillo. Esto puede ocurrir si la solicitud es forzada a trav\u00e9s de io-wq. Al reciclaje heredado le falta verificar si la buffer_list a\u00fan existe y si es del tipo correcto. A\u00f1adir esas verificaciones."}], "id": "CVE-2026-43366", "lastModified": "2026-11-11T20:10:00.273", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-43366", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T15:16:47.117231Z", "version": "2.0.3"}}]}, "published": "2026-05-08T15:16:47.623", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/439a6728ec4641ffad1ca796622c19bc525e570f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/50ad880db3013c6fee0ef13781762a39e2e7ef83"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/97b57f69fee1b61b41acbf37e7720cac9d389fa4"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a7b33671e418fca507feebd1d56e7f4952a4b25c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c2c185be5c85d37215397c8e8781abf0a69bec1f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f3fb54e7a8b4aadcc2836ee463eec8c88709b8aa"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-362"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: io_uring/kbuf: check if target buffer list is still legacy on recycle", "id": "2468231", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2468231"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-367", "details": ["A flaw was found in the Linux kernel. A vulnerability exists in the io_uring/kbuf component related to buffer recycling. There is a time gap where a buffer list, if empty, could be incorrectly upgraded to a ring-provided type. The legacy recycling mechanism fails to properly check the buffer list's existence and type, which could lead to system instability or unexpected behavior."], "name": "CVE-2026-43366", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-05-08T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-43366\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-43366\nhttps://lore.kernel.org/linux-cve-announce/2026050828-CVE-2026-43366-94ff@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[c7fb19428d67dd0a2a78a4f237af01d39c78dc5a,a7b33671e418fca507feebd1d56e7f4952a4b25c)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[c7fb19428d67dd0a2a78a4f237af01d39c78dc5a,50ad880db3013c6fee0ef13781762a39e2e7ef83)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[c7fb19428d67dd0a2a78a4f237af01d39c78dc5a,97b57f69fee1b61b41acbf37e7720cac9d389fa4)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[c7fb19428d67dd0a2a78a4f237af01d39c78dc5a,c2c185be5c85d37215397c8e8781abf0a69bec1f)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[c7fb19428d67dd0a2a78a4f237af01d39c78dc5a,f3fb54e7a8b4aadcc2836ee463eec8c88709b8aa)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "5.19"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,5.19)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.1.167,6.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.130,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.78,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.19,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.19.9,6.20.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.0,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-05-08T17:30:13.916516+00:00", "updated": "2026-10-23T02:15:14.697598+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}